首创案例教学方法的是20世纪20年代美国的( )
A．加州大学 B．德州大学 C．哈佛大学 D．州立大学
参考答案：C
写出对应的元素符号或元素名称或化学式：
Out of the crowded bus , who was dressed in a black suit and waved to a woman. [ ]
A. a tall man in his thirties stepped
B. stepped a tall man in his thirties
C. did a tall man in his thirties step
D. did a tall man step in his thirties
